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A block of mass 5 kg is resting on a frictionless surface. If a force of 15 N is

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Question: A block of mass 5 kg is resting on a frictionless surface. If a force of 15 N is applied, what will be its velocity after 3 seconds? (2022)

Options:

  1. 3 m/s
  2. 5 m/s
  3. 9 m/s
  4. 15 m/s

Correct Answer: 9 m/s

Exam Year: 2022

Solution: 

Acceleration a = F/m = 15 N / 5 kg = 3 m/s². Velocity after 3 seconds = a × t = 3 m/s² × 3 s = 9 m/s.

A block of mass 5 kg is resting on a frictionless surface. If a force of 15 N is

Practice Questions

Q1
A block of mass 5 kg is resting on a frictionless surface. If a force of 15 N is applied, what will be its velocity after 3 seconds? (2022)
  1. 3 m/s
  2. 5 m/s
  3. 9 m/s
  4. 15 m/s

Questions & Step-by-Step Solutions

A block of mass 5 kg is resting on a frictionless surface. If a force of 15 N is applied, what will be its velocity after 3 seconds? (2022)
  • Step 1: Identify the mass of the block, which is 5 kg.
  • Step 2: Identify the force applied to the block, which is 15 N.
  • Step 3: Use the formula for acceleration, which is a = F/m.
  • Step 4: Substitute the values into the formula: a = 15 N / 5 kg.
  • Step 5: Calculate the acceleration: a = 3 m/s².
  • Step 6: Identify the time duration for which the force is applied, which is 3 seconds.
  • Step 7: Use the formula for velocity, which is velocity = acceleration × time.
  • Step 8: Substitute the values into the formula: velocity = 3 m/s² × 3 s.
  • Step 9: Calculate the velocity: velocity = 9 m/s.
  • Newton's Second Law of Motion – This law states that the acceleration of an object is directly proportional to the net force acting on it and inversely proportional to its mass.
  • Kinematics – The study of motion, which includes calculating velocity, acceleration, and time.
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